JSON for Modern C++ 3.8.0

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~basic_json
| ## ◆ patch()
basic_json nlohmann::basic_json::patch | ( | const basic_json & | json_patch | ) | const
| inline
  JSON Patch defines a JSON document structure for expressing a sequence of operations to apply to a JSON) document. With this function, a JSON Patch is applied to the current JSON value by executing all operations from the patch. Parameters
  [in] | json_patch | JSON patch document
  Returns patched document Note The application of a patch is atomic: Either all operations succeed and the patched document is returned or an exception is thrown. In any case, the original value is not changed: the patch is applied to a copy of the value. Exceptions
  parse_error.104 | if the JSON patch does not consist of an array of objects
  parse_error.105 | if the JSON patch is malformed (e.g., mandatory attributes are missing); example: `"operation add must have member path"`
  out_of_range.401 | if an array index is out of range.
  out_of_range.403 | if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: `"key baz not found"`
  out_of_range.405 | if JSON pointer has no parent ("add", "remove", "move")
  other_error.501 | if "test" operation was unsuccessful
  Complexity Linear in the size of the JSON value and the length of the JSON patch. As usually only a fraction of the JSON value is affected by the patch, the complexity can usually be neglected. Example The following code shows how a JSON patch is applied to a value. 1 #include <iostream> 2 #include <iomanip> 3 #include <nlohmann/json.hpp> 4 5 using json = nlohmann::json; 6 7 int main() 8 { 9 // the original document 10 json doc = R"( 11 { 12 "baz": "qux", 13 "foo": "bar" 14 } 15 )"_json; 16 17 // the patch 18 json patch = R"( 19 [ 20 { "op": "replace", "path": "/baz", "value": "boo" }, 21 { "op": "add", "path": "/hello", "value": ["world"] }, 22 { "op": "remove", "path": "/foo"} 23 ] 24 )"_json; 25 26 // apply the patch 27 json patched_doc = doc.patch(patch); 28 29 // output original and patched document 30 std::cout << std::setw(4) << doc << "\n\n" 31 << std::setw(4) << patched_doc << std::endl; 32 } Output (play with this example online):
      {
          "baz": "qux",
          "foo": "bar"
      }

      {
          "baz": "boo",
          "hello": [
              "world"
          ]
      }
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/patch.cpp -o patch
See also diff – create a JSON patch by comparing two JSON values RFC 6902 (JSON Patch) RFC 6901 (JSON Pointer) Since version 2.0.0 Definition at line 23895 of file json.hpp.

nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2774
nlohmann::basic_json::patch
basic_json patch(const basic_json &json_patch) const
applies a JSON patch
Definition: json.hpp:23895